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A125dvsB320dDiesel
  • MotorwayMotorwayRange and charging
  • PerformancePerformance0-100, top speed
  • ConsumptionConsumptionYearly cost
  • Specs125d · 320d

BMW 125d F20LCI vs BMW 320d xDrive G20: which is truly faster?

Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.

compact · 2018 vs 2019 · Methodology
BMWDieselFaster

125d F20LCI

224 hp · 450 Nm · 1,480 kg · 2018

VS
BMWDiesel

320d xDrive G20

190 hp · 400 Nm · 1,540 kg · 2019

Result · 0–100 km/h

ABMW 125d F20LCI

6.48 s

Gap0.49 sin favour of 125d
BBMW 320d xDrive G20

6.97 s

Summary · Caralogy simulation
Measure125d F20LCI320d xDrive G20Gap
0–100 km/h6.48 s6.97 s0.49 s · 125d F20LCI
400 m standing start14.68 s15.09 s0.41 s · 125d F20LCI
1,000 m standing start26.40 s27.84 s1.44 s · 125d F20LCI
Top speed (electronically limited)240 km/h232 km/h8 km/h · 125d F20LCI
Power-to-weight ratio6.61 kg/hp8.11 kg/hpbetter ratio · 125d F20LCI

Watch the race

Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.

BMWDiesel125d F20LCI
Speed
0km/h
Timer
0,00s
Distance
0m
BMWDiesel320d xDrive G20
Speed
0km/h
Timer
0,00s
Distance
0m
100 m
200 m
300 m
400 m
500 m
600 m
700 m
800 m
900 m
1000 m
0m → 1000m
Gap0m

Stage-by-stage comparison

Simulated performance at each stage. Best value in bold.
Stage125d F20LCI320d xDrive G20
0–30 km/h1.88 s1.35 s
0–50 km/h3.03 s2.38 s
0–80 km/h4.83 s4.78 s · tight gap
0–100 km/h6.48 s6.97 s
0–120 km/h8.57 s9.84 s
0–160 km/h14.58 s18.31 s
0–200 km/h25.23 s34.62 s
400 m standing start14.68 s15.09 s
1,000 m standing start26.40 s27.84 s
Top speed240 km/h232 km/h

Parameters and assumptions

Simulation

Start
Standing, straight line
Surface
Dry asphalt, 23°C
Wind
None
Driver
1 person, 75 kg

Calibration

Splits
0–100, 0–200 manufacturer
Power curve
Real measurement (Caralogy)
VMax
Manufacturer limited
Transmission
Losses integrated in model

Physics model calibrated on manufacturer splits. The limited top speed is not the real aerodynamic top speed of the vehicles.

Under the bonnet

Manufacturer technical specifications. The power-to-weight ratio is the key physical factor in a drag race.

BMW

125d F20LCI

6,61kg/hpratio better by 1,50 kg/hp
CharacteristicValueDetail
Power224 hp4 cyl
Torque450 Nm
Weight1 480 kgmanufacturer kerb weight
Drivetrain-
Gearbox8-speed Steptronic
BMW

320d xDrive G20

8,11kg/hpcompensated by −60 kg
CharacteristicValueDetail
Power190 hpPending
Torque400 Nm
Weight1 540 kgmanufacturer kerb weight
DrivetrainIntegrale (AWD)
GearboxEight-speed Steptronic transmission

The start: 0 to 100 km/h

Off the line, the 125d hits 100 km/h in 6.48 s versus 6.97 s for the 320d xDrive. Despite the faster sprint time, the 320d xDrive is 8 m further along the track at this moment: stronger low-speed acceleration offsets a slower run beyond 100 km/h.

From 100 km/h to 400 metres

At 200 metres, the 320d xDrive is doing 119 km/h against 130 km/h for the 125d. The gap is 0.03 s. The challenger starts to claw back ground.

At 400 metres standing start, the 125d crosses the line in 14.67 s versus 15.09 s. The 0.41 s gap represents roughly 17 m of track - two to three car lengths.

Beyond 400 metres: top speed comes into play

Past 400 metres, the 125d continues to build its lead. At 600 metres, it runs at 180 km/h versus 165 km/h. At 1,000 metres, the 125d finishes in 26.39 s versus 27.84 s, with a 1.44 s lead. Both vehicles have similar top speeds (240 vs 232 km/h), preventing any comeback.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the 125d is capped at 240 km/h, the 320d xDrive at 233 km/h. This isn’t a physical engine limit - it’s a manufacturer choice, usually for tyre safety or homologation reasons. Neither car reaches its true aerodynamic top speed.

With two combustion powertrains, the difference comes down to power-to-weight ratio (6.61 kg/hp vs 8.11 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 11.52 seconds. The 0.49 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.

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Frequently asked questions

Over 0–100 km/h, 125d F20LCI wins (6,48 s vs 6,97 s).

125d F20LCI goes from 0 to 100 km/h in 6,48 seconds (calibrated simulation).

125d F20LCI: 224 hp, ratio 6,61 kg/hp. 320d xDrive G20: 190 hp, ratio 8,11 kg/hp.

125d F20LCI: 240 km/h. 320d xDrive G20: 232 km/h.